Structure of SAMs generated from functionalized thiols on gold

Tamada, Kaoru; Nagasawa, Jun’ichi; Nakanishi, Fusae; Abe, Koji; Hara, Masahiko; Knoll, Wolfgang; Ishida, Takao; Fukushima, Hitoshi; Miyashita, Satoru; Usui, Takayuki; Koini, Thomas; Lee, T. R.

doi:10.1016/s0040-6090(98)00618-x

Cited by 57 publications

(84 citation statements)

References 31 publications

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“…For the SAMs derived from the F8H10SH, the contact angle values are higher than those obtained from the C18SH film, which is consistent with previously observed values on SAMs derived from partially fluorinated adsorbates with the same degree of terminal fluorination [81,84]. The low surface energy enjoyed by fluorinated interfaces compared to hydrocarbon interfaces is consistent with the higher contact angle values observed on the F8H10SH SAM [85][86][87].…”

Section: Wettability Of the Filmssupporting

confidence: 90%

“…The band at 1150 cm -1 has been assigned as the symmetric C-F stretch of the CF2, while those at 1205 and 1250 cm -1 to the antisymmetric C-F stretches [60,80]. Complicating our analysis of the C-F spectra is the overlap of other vibrational modes, including C-C bond stretching and C-C-C bending at ~1220 cm -1 [60,81]. The bands in the 1150-1270 cm -1 range can be attributed to the stretches whose transitions dipole moments are perpendicular to the fluorocarbon chain, pd CF 2 [61]; correspondingly, the bands at 1336 and 1373 cm -1 have been identified as stretches with a transition dipole moment parallel to the fluorocarbon helical axis [61].…”

Section: Pm-irras Analysis Of the Filmsmentioning

confidence: 80%

See 1 more Smart Citation

Unsymmetrical Spiroalkanedithiols Having Mixed Fluorinated and Alkyl Tailgroups of Varying Length: Film Structure and Interfacial Properties

Chinwangso

Hill

Marquez

et al. 2018

Preprint

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Abstract:A custom-designed series of unsymmetrical spiroalkanedithiols having tailgroups comprised of a terminally fluorinated chain and a hydrocarbon chain of varying lengths were synthesized and used to prepare self-assembled monolayers (SAMs) on gold substrates. The specific structure of the adsorbates was of the formwhere n = 7, 9, and 12 (designated as F8H10-C10, F8H10-C12, and F8H10-C18, respectively).The influence of the length of the hydrocarbon chain in the bidentate dithiol on the structure and interfacial properties of the monolayer was explored. A structurally analogous partially fluorinated monodentate alkanethiol and the corresponding normal alkanethiols were used to generate appropriate SAMs as reference systems. Ellipsometric thickness measurements showed an unexpectedly low film thickness for the SAMs derived from the bidentate adsorbates, possibly due to disruptions in interchain packing caused by the fluorocarbon chains (i.e., phase-incompatible fluorocarbon-hydrocarbon interactions), ultimately giving rise to loosely packed and disordered films. Analysis by X-ray photoelectron spectroscopy (XPS) were also consistent with a model in which the films were loosely packed; additionally, the XPS spectra confirmed the attachment of the sulfur headgroups of the bidentate adsorbates onto the gold substrates. Studies of the SAMs by polarization modulation-infrared reflection-adsorption spectroscopy (PM-IRRAS) suggested that as the length of the hydrocarbon chain in the adsorbates was extended, a more ordered surface was achieved by reducing the tilt of the fluorocarbon segment. The wettability data indicated that the adsorbates with longer alkyl chains were less wettable than those with shorter alkyl chains, likely due to an increase in interchain van der Waals forces in the former.Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted:

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Section: Wettability Of the Filmssupporting

confidence: 90%

Section: Pm-irras Analysis Of the Filmsmentioning

confidence: 80%

Unsymmetrical Spiroalkanedithiols Having Mixed Fluorinated and Alkyl Tailgroups of Varying Length: Film Structure and Interfacial Properties

Chinwangso

Hill

Marquez

et al. 2018

Preprint

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“…It consists of immobilizing thiol‐ or disulfide‐terminated molecules onto gold substrate. [ 135 ] The chemisorption of thiol moieties on gold can form stable Au‐S bonds. We mentioned above that “grafting to” methods suffer from low grafting density because of the steric effect of macromolecules.…”

Section: Track‐etched Nanopore/membrane Fabrication and Functionalizamentioning

confidence: 99%

Track‐Etched Nanopore/Membrane: From Fundamental to Applications

2020

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Biomimetic and bio‐inspired membranes draw great attention and generate extensive efforts to solve environmental, health, and energy issues. In this field, track‐etched membranes present the advantage to be tuned from a single pore to a large‐scale multipore membrane. On one hand, from the large‐scale membrane to a single nanopore, the research becomes more fundamental, meticulous, and quantitative to describe concrete processes inside confined spaces. This allows understanding the role of the surface phenomena and nanoscale effects. On the other hand, working from a single pore to a multipore membrane allows perfect control of the membrane properties. This ensures a promising ability for upscale from the lab findings to applications. In this review, a global insight on the track‐etched nanopore/membrane is taken through presentation of fabrication and functionalization methods, transport properties, and the related applications. By functionalization, track‐etched nanopores can be used to understand ion transport under confined spaces with high aspect ratio, to analyze single molecules, to design stimuli‐responsive membranes, and to generate energy from salinity gradient and light.

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“…The structure of the semifluorinated thiol SAMs on the 10-nm Au/glass substrates was characterized with AFM and FTIR-RAS and compared with that on Au(111)/mica surfaces (11)(12)(13). We could obtain regular lattice images on F 10 H 2 ( Fig.…”

Section: Sam Structurementioning

confidence: 99%

“…In these SAMs, fluorocarbon chains are expected to be aligned nearly normal to the surface. On the other hand, with longer alkyl spacer groups (CF 3 (CF 2 ) 9 (CH 2 ) x SH, x = 6, 11, 17, 33) (7,(12)(13)(14) the helix is more tilted relative to the surface normal due to the interaction between alkyl spacer groups, resulting in different wetting properties and thermal stability for these SAMs (13).…”

Section: Introductionmentioning

confidence: 99%